The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 22, 2009
Filed:
Sep. 19, 2003
Mitsuru Mimori, Hachioji, JP;
Kouhei Ohta, Hachioji, JP;
Mitsuru Mimori, Hachioji, JP;
Kouhei Ohta, Hachioji, JP;
Konica Minolta Holdings, Inc., Tokyo, JP;
Abstract
An optical element comprises: a diffractive structure having a plurality of diffracting ring-shaped zones arranged around an optical axis on at least one optical surface; and an optical path difference giving structure arranged on an optical surface of at least one of the plurality of diffracting ring-shaped zones, for giving a prescribed optical path difference to a prescribed light beam passing through the diffracting ring-shaped zone, wherein the optical surface of the diffractive structure is a structure having a diffracting function for setting L-th (L≠0) order diffracted light of the light beam having the first wavelength λto a maximum diffraction efficiency and for setting M-th (M≠0) order diffracted light of the light beam having the second wavelength λto a maximum diffraction efficiency in case of an assumption of no existence of the optical path difference giving structure.